http://www.cimt.plymouth.ac.uk/projects/mep/default.htm - MEP math course - free! - The main math course of Maple Hill Academy
http://ceure.buffalostate.edu/~csmp/CSMP%20Program/Primary%20Disk/Start.html - another free math program - I have not researched this course, but have listed it as a possible alternative.
http://www.stanleyschmidt.com/FredGauss/index2.html - Life of Fred Books - a set of books that teach math concepts in a story format. Starts at fractions. - Probably will be used at Maple Hill Academy starting around year 7.
Math Enrichment Activities
http://nrich.maths.org/public/ - Monthly fun math puzzles and challenges - part of Maple Hill Academy
http://www.cimt.plymouth.ac.uk/resources/codes/default.htm - Free Codes and Ciphers course!
http://www.cimt.plymouth.ac.uk/resources/ - Links to uses for real life math, puzzles, etc.
Living Math Book Resources
http://www.livingmath.net/ - source of info on "Living" Math books
http://www.k-state.edu/smartbooks/gradeindex.html - "Living" Math Books